Fluid-pressure-actuated impact-tool.



HLMAN.

FLUD PRESSURE AGTUATED IMPACT TCU APPLIOATIOH FILED MAY 28, 90'

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APYLITGN FILED MAY 28, i907. y

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Ff @M f TED STATES PATENT caricia.

GEORGE H. GILMAN, OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, OF CLAREMONT, NEW HAMPSHIRE, A CORPORATION OF marne.

Specification of Letters Patent.

FLUID-PRESSURE-ACTUATED IMPACT-TOOL.

Patented Nov. 1, 1910.

'Application filed May 2s, 1907. seriai No. 376,060.

To all whom it muy concern? y Be it known that I., Gi:onoi: GILMA'N, a citizen of the United States, residing at. Claremont, in the county of Sullivan, State of'New Hampshire, have invented an VIniprovenient in I1`luid-Pressure-Actiiated Inipact'1`ools, of which the following description, in connection with the accompanying drawings, is a specification. like letters on the drawings representing like parts.

This invention relates to fluid pressure actuated impact tools of any suitabletype, a quarrying tool speeically intended for use as a'chipping hammer being represented in the present embodiment of the invention. It is, however, apparent that the invention may be employed in various relations. In order,A thatA the principles thereof' may be fully appa-rent, -reference is made to the single type or embodiment thereof shown in the accompanying drawings, wherein- Figure 1 is a vertical, longitudinal section of a chipping hammer with the pistonv thereof represented as in its` forward or inipact position; Fig. 2 is a similar view representing the piston as at or near the opposite end of its` stroke; Fig. 3 is a transverse section upon the line 3-3 of Fig.- 2.

Referring specifically to that single type or embodiment of the invention here shown, the casing, wherein the tool operating parts are mounted, is represented at l, it being of generally cylindrical formation, but at the handle end thereof having a lateral enlargtxv ment or offset 2.

The tool handle isrepresented at it having a hub like 4portion'lt adapted to'be sleeved upon the casing 1, and preferably' to contact with a shoulder 5 upon the latter. Herein an interiorly screw threaded collar having an intiirned flange 7 to engagethe shoulder 5, engages athreaded portion 8 upon the hub 4, thereby to secure the handle and the casing in operative relation. Preferably and as indicated in Figs. 1 and 2, the screw threaded portion 8 extends but partially arpund the hub 4, the upper end of the collar 6 engaging when the parts are positioned the bese of the lateral extension 2 of the casing 1.

lVhile the casing 1 may be provided with suitable pressure passages, preferably I position in said casing av cylinder S) having upon its periphery a pressure passage 10 leading from near the handle end of the cylinder to the lower end thereof and there coniinunicating, as at 11, with the interior ot the cylinder. Also periplierally formed upon the cylinder is a pressure passage herein shown as oppositely disposed with re- 6'()- spect to the-passage 10 and communicating with the interior of the cylinder at `a point between the ends thereof, as indicated at 'llhe cylinder l is provided with a relief pas; i

sage 14 registering with a similar passage 65' 15 in the casing a passage 16 being pr'ol vided in the cylinder and placing the intel rior thereof 1ncommunication with the pres-v y sure passage 12' intermediate the ends of ,the

latter. Y

Within the cylinder 9 is mounted for re-v ciprocation a piston 17 with a preferablyA reduced portion 18 whereof a tool or tols may if desired be operativelyl connected, the"l casing 1 being preferably of reduced Vdiaiii- 725', eter at its lower end to receive such reduced;v

end of the piston as indicatedV at 19. Pref-v erably the upper portion of the piston is aiinuliirly recessed, as indicated at 20, and is provided with a passage 21 indicated 11i dotted lines, such passage coniiiiunica'ting' :it its upper eiidavith the space betwcenthcV piston and the hear end of the cylinder S) and :it its opposite end with a transverse passage indicated 1n dotted lines and coiiiiiiunicating at opposite ends with the.

annular recess V20. ,y vAny suitable means may be providedto supply fluid under pressure to the operating ,A

poi-.tion 2S of the valve may be placed'in f register, as indicated in Figs. 1 and 2. Any 100 suitable means may be employed to reciprocate the throttle valve. Herein for the purpose is indicated a. lever 29 pivoted at 30" in the handle and provided with a portion operator, whereby vupon inward movement of the lever 29 the valve niay be moved to the position indicated. Preferably a pin 32 is provided upon the handle to engage a suitable slot 33 in the lever 2f) to limit 110 il'adapted to be ergaged by the hand of the 105 justable abutment.

t-lie movement of the latter. Preferably a Coil spring 34 is provided tending normally tp return the throttle valve 'to closed position, .such spring being positioned about the inner end of an adjustable abutment-l 35 and engaging at one end the end 36 of the throttle valve and at its opposite end engaging a washer 37 tightly engaging the inner surface of a recessed portion of a sleeve or bushing 38, herein shown as screw threaded into the handle 3 and provided'with an axially disposed screw threaded opening 39 to receive the screw threaded portionl() of the adjustable abutment 35, lthe latter being also provided with a preferably integral` annular enlargement 41, herein shown as having teeth 42..engaging similar teeth upon the washer 43. The outer end of the adjustable abutment may be provided with a knurled handle portion 44 to permit convenientoperation thereof. -By rotation ot' the adjustable .abutment 35, the longitudinal position thereofi may be adjusted and the innerend positioned as desired to limit the opening movement of the throttle valve, the spring 34 being compressed to any desired extent by such rotative 'movement of the ad- In order to afford a means whereby the extent of inward movement of the adjustable abutment and the compression of the spring may be accurately' ascertained, the toothed washer 37 and toothed enlargement 41 upon the adjustable abutment are provided. The washer may partake of the longitudinal movement ofthe adjustable abutment, but is prevented from rotative movement by its tight frictional engagement with the inner face of the sleeve or bushing 38. Withh this construction ofv parts, upon rotative movement of the abutment, the'workman may, by counting the clicks made by the lrotative movement of the teeth of the abutment past theteeth of the washer, determine the position of longitudinal adjustment of the abutment. Moreover, the interengaging teeth maintain the abutment in its adjusted position.

The upper portion of the lateral extension 2, viewin Figs. 1 and 2, is adapted when positione to 'engage with an inwardly projecting shoulder 45' at the upper end of the hub like portion 4 of the handle. Such lat# eral extension 2, as most clearly indicated in Fig. 3, is provided with a` Ycylindrically shaped recess disposed in parallelism with the cylinder 9 to receive therein a 'valve block 46 having a series of longitudinally disposed peripheral pressure passages' 47 therein com.- munfcating at their upper end with the lower end of the pressure supply passage 24 in the handle, such passage 24 'for this purpose being provided with an annular extension 48. The valve block is axially reies'sed- 4to receive therein a valve 49, herein shown as hollow'and having an end 50of reduced 'ings 47 of 1 cess 51, which, in the described position of vided with a relief` opening 55 registering y with a similar opening 5G in the lateral'extension 2 and opening 57 in the hub portion 4 ot' the handle. AThe said valve casing is to also provided with an' opening 58 ada-pte registery with an opening 59 in the'casing 1, andan opening C() in the npper-portioirof (he cylinder 9, whereby fluid pressure may be supplied t'o the upper or head end ot' the piston l?. As indicated in dotted lines in Fivs. l and 2 andin full lines in Fig. 3. the cylinder 9 is provided with a substantially semi-annular pressure passage G1 near its upper end and communicating at one end with the upper end of lhevpi'essure supply passage 10 and at its other end with a short transverse passage 62 (see Fig. 3) in theVv casing 1, whereby the passage (S1 is placed in communication with an opening G3 Ain the valve casing 46. The pressure passage 12 periplierallyformed upon the cylinder 9 communicates at its upper end with a short transverse passage G4 formed in the base of thc lateral extension 2 and communicating with an annular passage 65. lreferabl y )ositioned within the hollow valve 46 is a plug G6 shaped to conform to the inner, surface of such valve and having a base (37 adapted to be received upon the lateral extension 2 and to receive upon its upper face the valvl` block 4G. The base 67 of the block is provided with a. Suitable number of longitudinally dis osed passages G8, whereby .the lower annu ar end of the valve 49 is exposed to pres? sure through the passages-12 and 64.

When the lever 29 is operated to force the throttle valve into the position indicated in Figs. 1 and 2, fluid under pressure is supplied through .the passage 24 and iinpinging upon the upper end 50 of thevalve 49 forces the saine downwardly or into the position indicated in F ig. l. In such position of the parts, pressure is supplied through the longitudinal peripheral openthe valve block to the annular rethe-valve', is in register with the openings 58,' 59 and 60, whereby pressure is supplied to the head end of the pistoirl?, thereby forcing the same downwardly or into the position indicated in Fig 1. thereby imparting a working stroke to the topl. As the piston moves downwardly upon its working maare A Q stroke, tlie annular recessed portion 20 there means to sup ly pressure to said valve, pas- 65 of comes in register with the openin 16 in sages adapted to place latter in communithe wall of the cylinder. 9, ,whereby t irough cation with the cylinder, said handle orthepassages 21 andi 22, pressure passes from tion embracing the cyliunder and the o set the head end of the piston through the pas` ortion thereof and extending below the sage 12 and thence by the transverse passage atter, and clamping means for securing the 70 64 in the base'of'the extension 2 to the lower handle portion to the cylinder below said annular. end of the valve 49,- thus lifting the offset portion. l same to the osition indicated in F ig. 3. A fluid-pressure actuated impact tool When the va Ve 49 is lifted to the posihaving a handle portion and a cylindr portion shown in Fig. 2, pressure is also pertion, the latter provided with an enlarged 76 mitted to escape from the space above offset portion having a valve chamber/said 'the hcad end of the cylinder through the handle portion forming annd closurefor ropenings 60,59 and 58, thence about the the cylinder and the valve chamber and ex- 15 annular passage 52 and through the relief tending to the cylinder' below the offset poropenings 55, 56, and 57 to the atmosphere. tion thereof, and clamping means thereat to 80 With the valve 49 in the position shown in clamp the handle portion tothe cylinder Fig'. 2, pressure then passes by the longitudiportion.

nal peripheral passages 47 to the annular 4. A fluid-pressure actuated impact tool recess' 51 of the valve49 and froxn'thence having a cylinder, a valve 'chamber conthrough the opening 63, the passage G2 and tained in au enlarged offset portion of the 85 the semi-annular passage (i1 to the longitudicylinder, a valve in said valve chamber, a nal` assage 10, -whereby ,fluid pressure is handle portion, a shoulder on said cylinder supp ied to the lower end of the piston, and below said offset portion and a Athreaded thereby acts to elevate the same to the posicollar adapted to clamp said .handle portion tion indicated inFig. 2. As the piston 1s so to said cylinder-by engagement with said 90 elevated, the relief,openings 14 and 15 are shoulder and said handle portion. exposed so that the fluid under pressure be- A fluid pressure actuated impact tool neath the piston may escape to the atmoscomprising a casing 1. a handle 3 having a l phere, and upon further upward movement hub portion 4, said casing heilig provided of the piston the opening 13 at the lower with a lateral enlargement 2 and the hub 95 end f the passage 12 iS exposed S0 that the portion provided with a corresponding enfluid under pressure that has maintained lai-ged portion. a plug GG mounted in said the, valve 49. elevated as shown in ltig. 2, enlarged portion 2, a hollow -valve 49 closetl 35 may escape through the relief openings 14 at one end and having annular passages 51 -an 15, thus permitting the valve to be and 52. means to supply Huid pressure to 100 moved downwardly by pressure impinging said valve.. and fluid passages connecting upon the constant ressure end 50 thereof said annular passages` of said valve with into the position in icated in Fig. 1, whereopposite ends of the easing 1. f upon the cycle of operation described will G. A fluid pressure. actuated impact tool be repeated. comprising a casing having a-cylinder there- 105 Having -thus described one type or emin. a piston mounted for icciprocation in: bodim'ent of my invention, I desire it to be. said cylinder. said casing having a lateral understood that although-specific terms are enlargement 2, a handle provided with a huba 4:5 employed, they are used in a generic and like portion 4 laterally enlarged to receive descriptive Sens@ and 110i) OI PUIPOSGS Of the enlargement 2, a valve block mountedan 'limitat-iomthe sco j' of the invention being said enlargement 2. a hollow differential set forth in the foldwing claims. valve mounted in said valve block and hav-- i lg' fluidressure actuated impact. tool ing a closed end exposed toconstant pres.- having a han le p qti'onand a cylinder porsure, a plurality of annular grooves being tion, thedatter priivided Witlran enlarged provided upon said valve, one of said 115 offset portion having a valve chamber, a grooves being adapted alternately to supply valve mountedfor movement in said valve@ pressure to `opposite ends of said piston chamber, said handle portion embracing the -through said valve block, and the other of end of said cylinder portion and extending said grooves being ladapted to permit the down below .the o-ii'set portion thereof, and escape of pressure' from' one end of said 120 suitable clampinl means for# positively piston. clamping the han le portion Vto the cylinder In testimony whereof, I haveslgned my portion below the said offset portion. I name to this. speciicatlon, in the presence .60 2. A Huid-pressure actuated impact tool of two subscribing witnesses.

having a handle portionvand a cylinder por- GEORGE I-I. GILM'AN.' tion, the latter' provided with an enlarged lVitnesses: 1 oet portion, a valve block in said ofsetv H. C. BERKEY,

portion, a valve adapted to seat therein, WM. Mronam... 

